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Q. The time constant of an RC circuit is 4.8 s. How much time t is required for the capacitor (uncharged initially) to gain one-half of its full equilibrium charge?

Q. A tennis ball (m = 59 g) is projected vertically with an initial speed of 9.7 m/s.

(a) If the ball rises to a maximum height of 3.1 m, how much kinetic energy was dissipated by the drag force of air resistance?

(b) How much higher would the ball have gone in a vacuum?

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